It is composed of a heating conductor, an insulating layer of tightly compacted mineral powder (usually magnesium oxide powder) and a metal sheath. For copper sheathed heating cables, a layer of high-density polyethylene (HDPE) or flame-retardant HDPE plastic jacket can be extruded on the outer circumference of the metal sheath according to the needs of anti-corrosion and anti-mechanical damage in the place of use. Commonly used structures are single-core and two-core, and can also be designed and provided with three-core and above mineral insulated heating cables according to your needs. The sheath materials include copper, cupronickel, austenitic stainless steel (304L, 321, 316L, 347, etc.), inconel and 825 high temperature corrosion resistant alloy, etc., which should be selected according to different operating temperatures and corrosive environments.